Control the temperature of thermistors, fans, or other equipment

This electronic circuit can be used to control the temperature of thermistors, fans, or other devices, and a very simple electronic temperature control circuit can be constructed. Tear open or close the controlled temperature setting using a potential of 50kHz. When the temperature exceeds the preset low temperature, the T2 transistor activates the relay thermal element (thermistor), or if a fan is connected to the relay terminal, the circuit will turn off the fan. The transistor of T1 must be of NPN type BCY58 (or similar) and the transistor of T2 must be of PNP type BCY78 (or similar). Thorium thermistors must be installed in that location and require a constant temperature (temperature control). This electronic temperature control circuit requires a 24V DC power supply, so you need to use a 24V relay. The thermistor value used in this project is 5K ohms. This electronic circuit can be used to control the temperature of thermistors, fans, or other devices, and a very simple electronic temperature control circuit can be constructed. Tear open or close the controlled temperature setting using a potential of 50kHz. When the temperature exceeds the preset low temperature, the T2 transistor activates the relay thermal element (thermistor), or if a fan is connected to the relay terminal, the circuit will turn off the fan.  diode